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Retirement Plans (Tables)
 9 Months Ended
Sep. 27, 2020
Retirement Benefits [Abstract]  
Net Periodic Defined-Benefit Pension And Other Post-Retirement Benefit Cost
Net periodic defined-benefit pension and other post-retirement benefit (credit) cost for the three- and nine-month periods ended September 27, 2020, and September 29, 2019, consisted of the following:
 
Pension Benefits
Other Post-retirement Benefits
Three Months Ended
September 27, 2020
 
September 29, 2019
September 27, 2020
 
September 29, 2019
Service cost
$
29

 
$
28

$
2

 
$
2

Interest cost
123

 
150

7

 
9

Expected return on plan assets
(234
)
 
(228
)
(9
)
 
(9
)
Recognized net actuarial loss (gain)
87

 
98

—

 
(2
)
Amortization of prior service credit
(4
)
 
(4
)
(1
)
 
(1
)
Net periodic benefit cost (credit)
$
1

 
$
44

$
(1
)
 
$
(1
)
Nine Months Ended
 
 
 
 
 
 
Service cost
$
88

 
$
84

$
7

 
$
6

Interest cost
369

 
450

21

 
27

Expected return on plan assets
(703
)
 
(684
)
(27
)
 
(27
)
Recognized net actuarial loss (gain)
246

 
238

(2
)
 
(6
)
Amortization of prior service credit
(13
)
 
(13
)
(1
)
 
(3
)
Net periodic benefit (credit) cost
$
(13
)
 
$
75

$
(2
)
 
$
(3
)